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(No Model.)

H. DORRITY.

COOLING APPARATUS POR MLLSTONBS.

No. 249,910. Patented Nov. 22,1881.

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74?? asses ilivrTED STATES PATENT OEEICEO HENRY DORRITY, OF NEW YORK, N. Y.

COOLING APPARATUS FOR MILLSTONES.

SPECIFICATION forming part of Letters Patent No. 249,910, dated November 22, 1881,

To all whom at may concern:

Be it known that I, HENRY Douurrr, of the city and county of New York, in the State of New York, have invented a certain new and useful Improvement in Cooling Apparatus for Millstones, of which the following is a specification.

The object of my invention is to provide for the more effective cooling of millstones in mills for grinding paints or other substances or materials. y

The invention consists in the combination, with an upper stationary millstone and a lower rotary stone or runner, each having au internal cavity through which a cooling-fluid may circulate, of pipes for supplying cooling-fluid to and conducting it from the upper stationary niillstone, a bail constructed with a passage or passages which communicate with the cavity in the lower stone or runner, and an inlet pipe or pipes which pass downward through the eye of the upper stationary millstone and communicate with the passage or passages in the bail for supplying cooling-duid thereto and through the bail to the lower millstone or runner. Both the upper and lower millstones are preferably provided with a circuitous or zigzag passage or passages, through which the cooling-fluid is circulated,and which form the cavities before referred to.

In the accompanying drawings,Figure lrepresents a centralvertical section of a portion of a mill embodying my invention; and Figs.2 and 3 represent, respectively, horizontal sections of the upper and lower millst'ones.

Similar letters of reference designate corresponding parts in all the figures.

A B designate, respectively, the upper stationary millstone and the lower rotary millstone or runner. Although I have herein referred to these parts as millstones, I mean to include any bodies the adjacent surfaces of which form grinding-surfaces, whether they be made of stone, metal, or other material. Each millstone is here represented as composed. of two pieces, forming between them a cavity, which may consist of a single chamber'or of a circuitous passage or passages leading from the center of the stone to its circumference and returning to the center. The two pieces forming each stone are secured together by a cir- Application filed August 23, 1881. (No model.)

cuinfereutial band, a, and a thimble or bushing, b, which is inserted at the center of the stone. The thimble or bushing b of each stone is surrounded above and below the cavity therein with a packing-ring, c, which prevents leakage of the fluid employed in cooling from the cavity.

The upper or stationary stone, A, may be supported in any suitable way, and the lower rotary stone or runner, B, is rotated by a vertical shaft or spindle, C, having fixed upon its upper end a bail, D, comprising lugs or ears d, which engage with notches e in the stone. The central cavity in the upper stone, A, is composed of two passages, f f (Best shown in Fig. 2.) Each of the passages is circnitous, running from the circumference of the stone inward to the eye A', thence to and along the circumference, thence to the eye, and finally to the circumference. The cooling-fluid, which may be air or water, is supplied to the passagesfj" by pipes g, one of which is shown in Fig. 1, and, following the course indicated by the arrows in Fig. 2, it escapes through pipes g', one of which is shown in Fig. 1. The uid escaping from the pipes g', if it be water, is delivered into a drip-pau, E, from which it escapes through a pipe, g2.

The cavity iu the lower stone or ruimer, B, is composed oftwo passages, h h. (Best shown in Fig. 3.) Each of these passages is circuitous, running from the eye of the stone outward to and along the circumference, thence inward to eye, thence outward to and along the circumference, thence inward to the eye, and finally outward to the periphery.

The bail D is constructed with two passages, t', each of which communicates with the inner end of one of the passages h h', and the cooling-fluid, which enters the passages h h through the passages t' in the bail, follows the course indicated by the arrows in Fig. 3, and finally escapes at the circumference through escapepipes j into the drip-pan E, as seen in Fig. 1. The cooling-fluid is supplied to the passages t in the bail D by means of pipes F, which pass through the eye A of the upper stone and communicate at their upper ends with a chamber or head, G. The said chamber or head Gis adapted to rotate upon a stationary supplypipe, H, from which it receives the cooling- IOO fluid. It will be seen that the cooling-fluid is supplied separately to both stones, and the cooling is accomplished in a very elfective manner.

It is obvious that instead of having two separate circuitous passages, each stone might have one only, and in such case the bail might have only one passage ft' and only one pipe F be used.

In a former patent I have shown a bail provided with passages through which liquid passes from the upper to the lower stone; but in my present invention the upper stone is sup plied with and exhausted of liquid by pipes entirely independent ofthe lower stone, and the pipe or pipes which pass downward through the eye of the upper stationary stone are for supplyingthecooling-fluid directly to the lower stone or runner. By supplying the coolingiiuid to both stones separately better results are obtained.

What l claim as my invention, and desire to secure by Letters Patent, is-

1. The combination, with the upper stationary stone, A, and the runner or rotary lower stone, B, each having an internal cavity, of'

pipes for supplying a cooling-uid to and exhausting it from the stone A, a bail for the runner B, constructed with a passage or passages which communicate with the cavity therein,and an inlet pipe or pipes, which pass downward through the eye of the stone A and communicate with the passage or passages in the bail, whereby the cooling-fluid may be supplied to the lower stone, B, without first passing it through the upper stone, A, substantially as specified.

2. The combination, with the stationary stone A, having one or more internal circuitous passages, and the supply and escape pipes g g for a cooling-fluid, of the runner B, also having olie or more. passages, h h', the bail D, having one or passages, t', communicating with the passage or passages in the stone, and a pipe or pipes, F, passing through the eye of the upper stone and communicating with the passage or passages in the bail, substantially as specified.

HENRY DORRITY.

lVitnesses:

CHANDLER HALL, FREDK. HAYNEs. 

